import com.fasterxml.jackson.databind.ObjectMapper;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

class Request{
    public String username;
    public String password;
}
class Response{
    public boolean ok;
}
@WebServlet("/json")
public class JsonParameter extends HttpServlet{
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        Request request =objectMapper.readValue(req.getInputStream(),Request.class);
        System.out.println("username"+request.username);
        System.out.println("password"+request.password);
        Response response = new Response();
        response.ok =true;
        String respjson =  objectMapper.writeValueAsString(response);
        resp.setContentType("application/json;charset=utf8");
        resp.getWriter().write(respjson);
    }
}